Transmission mechanism



2 SheetsSheet 1 .vl/111;? im 8 T a a J. F. JOY

TRANSMISSION MECHNISM [Ulu 1,/

Original Filed Jan. 29, 1936 mmwil) Feb. 20,` 1940.

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Feb. zo, 1940. q. F. Joy 2,190,926

. TRANSMISSION MECHANISM Original Filed Jan. 29, 1936 lig. l M 3557220{if/8.

2 Sheets-Sheet 2 I lzvezaifz' 7058797925709 l y;

Patented Feb'. 2o, `1940 PATENT Nori-ICE TRANSMISSION MEoHANIsM JosephF. Joy, Pittsburgh, Pa., assgnor to suuivan Machinery Company, acorporation of Massachusetts l Application January 29, 1936, Serial No.61,321

Renewed November 28, 1938 16 Claims.

l This invention relates to transmission mechanisms, and moreparticularly to improvements in a transmission mechanism of the typeembodying high and low speed drivingmeans, thelow speed drive variablethrougha wide range, together with improved means for controlling thehigh and low speed driving means. l

The` improved transmission mechanism is particularly adaptable to thefeeding means of coal cutting machinery, and particularly to coalcutting machines of. the flexibly fed, continuous cutter, floor cuttingltypewhich is movable over the mine floor during operation ofA themachine and which employs a flexible haulage means on the machine forfeeding the machine over the mine floor. In the feeding of coal cuttingmachinery 'of the above character, it is necessary to` provide apowerful feed, butat the `same time it is"desirable to provide means forprecluding the possibility of the exertion of an excessive feeding forceresulting in overloading of the machine. It is also desirable to set thelow feeding speed to suit the particular conditions of' cutting and thento permit release of the low speed drive and connection of the highspeed drive, and therel after to return to the low speed .drive withoutthe bodied therein meansfor accomplishing the desirable features aboveenumerated. Another object is to provide an improved transmissionmechanism having improved high and low speed driving means and improvedmeans for varying the low speed drive through a wide range of speedsbetween zero and a predetermined maximiun low `feeding speed.v Yetanother object is to provide `selective `intermittent or` continuous lowspeed drive. A further object isto provide an improved transmissionmechanism having a predetermined high and variable low speed drivingmeans, im-

" proved means for varying the low speed drive, and

improved controlling means for both drives. A still further object is toprovide, in a transmission mechanism of the above character,` a lowspeedvariable drive embodyingan intermittent transmission device intheform of a friction l clutch through which power is transmitted toeffectzdrive, and having improved means forfintermittently `releasing'the clutch at timed `intervals,together with means for varying theintervals `of` clutch` release.` A further` object is to l (Cl.74-1Z5.5) l

provide an improved load-limiting means for the variable low speeddrive,whereby the low speed drive clutch is adapted to slip`automatically upon overload thereof. Still another object is to providean improved transmission mechanism having predetermined high `andvariable low speed drives, and improved controlling means thereforwhereby the drive may be quickly shifted from `low to high speed drive,and then back to low speed drive without resetting the driving speed ofthe low speed drive and under the control of but a single operatingmember. and other' objects and advantages of the invention will,however, hereinafter more fully appear.

.. In the accompanying drawings, .there is shown,

for purposes of illustration, one form which the invention may assume inpractice.

In these drawings, l

Fig. l isa plan view of a coal cutting machine having embodied thereinthe illustrative form of the improved transmission mechanism. l

Fig. 2 is an enlarged horizontal sectional View,` with parts shown inplan, of the feeding end of the machine shown in Fig. 1.

Fig. 3 is a cross sectional view taken substantially on line 3--3 ofFig. 2. l

Fig. 4 is a detail sectional view taken substantially on line 4-4 ofFig. 3.

Fig. 5 is a cross sectional view taken substantially on line` 5--5 of.Fig. 2.

Fig. 6 is a plan view of the transmission mechanism shown in Fig. 2,with parts broken away in section.

Fig. '7 is a cross sectional view taken substantially on line 'l--l ofFig. 2.

Fig. 8 is a detail sectional view taken substantially on line 8`8 ofFig. 6.

Fig. 9 is a detail sectional View taken substantially on line 9-9 ofFig. 6.

Fig. l0 is a detail sectional View taken substantially on line lll-l ofFig. 6.

In this illustrative embodiment of the invention, the improvedtransmission mechanism is shown embodied in the feeding` means of a coalmining machine lof the `iiexibly fed, continuous cutter, longwall type,generally comprising a body l having a smooth bottom surface 2 adaptedto rest upon and slide in any direction over the mine oor. Pivotallymounted at 3 on oneend of the machine body'for horizontal swingingmovement with respect thereto about a vertical axis, is anelongatedzplane cutter bar 4 carrying on its margin for circulationthereabout, an endless cutter chain 5. As is common in mining machines`ofv the type disclosed, the cutter bar 4 is swingable These intodifferent angular positions relative to the machine body and isadaptedto belocked in its different positions by any suitable locking means.The machine is fed over the mine floor during maneuvering of the machineat a relatively high machine-moving speed, and during the cuttingoperation at variable'low speeds, by means of -a haulage means on themachine, vc'omprisinga horizontal cable winding druml arranged at theopposite end of the machine body for rotation about a vertical axis andhaving wound thereon a flexible feeding cable l. Arranged at oppositesides of the feeding drum are horizontal guide sheaves i for guiding thefeeding cable 'l with respect to the feeding drum-l during the variousoperations of the machine. The feed cable 'l is connectible to thecutter bar l in a usual manner,

and when the bar locking means is released, the

feed cable may be wound in by the feed drum to effect swinging of thecutter bar about its pivot, from the dotted-line moving positionindicated in Fig. l to the right-angle cutting position indicated infulllines in that gure. feeding of the machine along the coal face, the feedcable is extended from the feed drum in the manner indicated in fulllines in Figs. 1 and 2,

and is connected at its free end to a suitable an-` chor located inadvance oi the machine, near the coal face; and as the feed cable iswound in, the

machine is fed :bodily over the mine floor to cutv a horizontal kerf inthe mine wall, in a manner well understood by those skilled in the art.The cutter chain 5 is driven, through suitable connections not shown, bya motor S, herein preferably of thereversible type, having its powershaft it horizontally disposed and extending longitudinally of themachine body.

Now referring to the improved transmission mechanism between the motorpowershaft and the. feed drum for rotatingthe latter in one directionthrough a wide range of low, speeds and in the opposite direction at apredetermined high machine-moving speed, it will be noted that keyed tothe motor power shaft ill is a motor pinion l l (Fig. 2) meshing with aspur gear i2 keyed to a horizontal shaft i3 extending longitudinally ofthemachine body and suitably journaled within vthe feed frame sectionll. `llixed to and rotatable va spur gear d speed terminal drivingelement of thelhigh speed with the shaft i3 is a spur gear l5 meshingwith It, herein constitutingV the high drive. The hub il of thegear i6is suitably journaled within thefeed frame section andis connectible bya multiple disc clutch Ity of a usual design rto a horizontal,longitudinally extending, tubular shaft i9, herein Aarranged parallelwith the shaft i3 and likewise suitably journaled within the feed framesection. The hub ifi of the gear l t is keyed to a transmission shaft2G, herein extending centrally through the shaft I9 and suitably journaled withinthe feed frame section.

Keyed to the .endof theA shaft 29 remote from the spur gear i6, isa'spur `gear, 2i meshing with a spur gear 22 keyed -to a horizontal,longi- During the` connectible by a multiple disc'clutch 21 of a usualdesign, to the shaft i9. Preferably formed integral with the tubularshaft i9 is a wormt Suitable means for loading the disc clutches EE Aand2l of the high and low speed drives is provided, including means foreffecting selective intermittent or continuous loading of the low speedclutch 2'. and for further providing a maximum load limit. This improvedclutch-loading means comprises a cam 35 formed on the sleevelikeclutchhousing 35 integral with the low speed terminal gear 26, andengageable with the surface of this cam is a plunger 3l guided in a bore33 formed in a bracket 39 supported within the feed frame section. Theopposite end of `this plunger is engageable with a horizontal lever#lilA pivotally connected at il on a vertical axis to an adjustable,horizontally swingable bell crank dthe latter herein providing anadjustable fulcrum for the lever dil. This bell crank is pivotallymounted at i3 on a vertical axis Within the feed frame, and has its armM. engageable'by an adjusting screw-iii threaded within the end wall ofthe `feed frame section and having a suitable 0perating handle 15B.Pivotallyconnected at llfto the lever dii, between its end engageablewith the plunger 3l and its pivotal connection 4I, is a horizontal rodherein extending transversely across the'feed frame and rpivotallyconnected at @9 at its opposite end to a lever 5). The lever Eil ishorizontally swingable about a verticalaxis at 5l; and pivotallymountedon an'axis coinciding with 5i, at 52, is a horizontally swingableshipper yoke vlever 53. For adjusting the angular relation oi theshipper yoke lever 53 about its pivot with respect to the lever 5U,there are formed on the lever 5t upstanding lugs 54, 5d each havingthreaded therein adjusting screws 55` engaging the opposite sides of alug 5S formed on the shipper yoke lever y53. By adjusting the screws theshipper yoke lever may be set in the proper predetermined angularposition relative to the lever 5B. `The shipper yoke lever 53 isengageable with a shipper ring 5l axially slidvably mounted on the shafti9 for pressing-the discs ofthe low speed clutch 2l' togetherto applythe latter. The high speed clutch I8 is provided rwith.asimilar shipperring 5&3 axially slidable on the shaft it? to press the discs of thehigh speed clutch together to apply the latter; andfengagev able withthis shipper ring 58 is a shipper yoke lever 59 pivoted for horizontalswinging movement at til. Pivotally connected `to the shipper yoke lever53 at 6l is an adjustable link 62 having a turnbuckle adjusting block63, the linkin turn being pivotally connected at 64 to the shipper yokelever 59. This link connects the shipper yokelevers together forsimultaneous swinging movement,. while affording relative adjustmentbetween the levers. The lever 50 is pivotally connected through a pinand slot connection 66 with a rod el threadedly secured at 68 to a block69.

This block is slidably mounted in transverse a` vertical slot i2 in thevblock vand formed on a.

disc 'l3`,integral with an operating shaft M, Vthe l latter having-anoperating lever 15. Adjustably threadedly secured to the rod 67 is a nut`lli, and

t slot of the pin and slot connection into engagei is positioned to movethe rod 61 from the neutral interposed between the` washer 11 engagingthis nut and the lever 50, is a coiled spring 18.` This coiled springisset under a predetermined pressure to effect maximum loading of thelow speed i disc clutch 21, and constantly urges, through the levers dand 53, the clutch shipper ring 51 to` wards `its clutch-applyingposition. When the operating lever 'iii is swung to rotate the eccentricpin from its neutral position shown in Figs. 2, 6 and 8, to theleft-hand dottedeline position indicated in Fig. 8, `the block 69 isslid inwardly within` its guideways, moving `the rod 61 to swing thelever 50 inwardly about itspivot to effect swinging of the shipper yokelevers 59, 53 to release the low speed clutch 21 against the pressureor" the coiled clutch-loading spring 18 and to apply the high speedclutch I8. When the @lever 59 is swung `into its high speedclutch-loading position, ,the link 4,8 connecting the lever 50 with thelever 4t` moves the latter into a position out of engagement with theplunger 31, so `that as the cam 35 rotates, the plunger remains idlewithin its guide s bore. `When the operating lever 15 is swung into itsopposite position, Vthe eccentric pin is rotated into theright-handdotted-line position shown i `in 8, sliding the 'block B9outwardly within lever 15 is swung to rotate the eccentric pin into its`neutral position indicated in full lines in Fig. 8, the rod 61 is movedto bring the end of the ment withthe pin on the lever 59 so that thecoiled clutch-loading spring 18 is rendered inactive with the lever 5l]inthe position to release thelow speed clutch 21. When the eccentric pinposition shown in Figs.`2 and 6 to the` position wherein the' coiledclutch-loading spring 18 acts on the lever 59 to effect application ofthe low speed clutch 2,1, the operator may rotate the handle 46 of theadjusting screw 45 to adjust the latter to swing the bell crank lever 42about its pivot to varythe location of the fulcrum point 4I ofthe lever49, and as a result, the engagement `of the lever 40 with thecam-operated plunger"31 may be varied so that the range of i swingingmovement of the leverl 49, and consequently` that of the lever 59, maybe zvaried,`

thereby to Vary the time intervals or" intermittent release of thejlowspeed clutch 21.`

It will be evident from the foregoing descrlp` tion that when the partsare in the neutral po` sition shownin Figs. 2 and 6, the operating lever15`inay be swung to move the eccentric pin and rod 61 into the positionwherein the coiled clutchloading spring 18 effects loading of the lowspeed clutch 21; and when the fulcrum `point of the lever 40 is properlypositioned the plunger 31 re-` mains idle Within its guide bore, withthe low speed clutch 21 held in applied position to effect continuousdrive` at the maximum low speed. In other words, when the low speedclutch 21 is conftinuously applied `and the intermittent clutch releaseconnections are in the proper position `the lever 4i) remains stationaryas regards swinging lever 42, and the` swingingmovement of the lever vapply and release the low speed clutch 21.

40 is transmitted through the link 48 to the lever" movement of thelever 5t causes the shipper yoke lever 53 to swing therewith, therebymoving the clutch shipper ring 51 axially intermittently to At this`time the shipper yoke lever 59 for the high speed clutch I8 ismaintained in its released position. By adjusting the screw 45 to swingthe bellcrank lever 42 about its pivot, the fulcrum point 4I of thelever 49 may be varied so `that its range of swinging movement eiectedby the reciprocating plunger 31 may be correspondingly varied. When theadjusting screw 45 is adjusted into its outermost position, the fulcrumpoint of the lever 4l] is swung to move the lever about its i pivotalconnection withthe link 48, so` as toirelease entirely the lever 49`from the` action of the plunger-` and `when the operating `lever 15 is.swunginto `its low speed clutch-applyingposition, the low speed clutch21 is held applied by the coiled clutch-loading spring to effect acontinuous low speed drive at `the maximum low speed.` By varying theposition of the fulcrum point of the lever lll between its innermostand` outermost positions, any desired engagement of` the lever with theplunger 31 may be afforded to obtain` any desired time intervals ofrelease of the low speed clutch 21. The coiled clutch-load` ing spring18, when the clutch shipper yoke lever 53 is in loading position, isadapted to yield upon overloading of the low speed clutch 21. By turningthe operating lever 15 of the eccentric operating means for the slidingblock 69, the latter may be slid inwardly to swing the lever 59 aboutits pivot against the pressure` of the coiled clutchloading spring 18 torelease the clutch shipper yoke lever 53 from the shipper ring 51 and tobring the clutch shipper yoke lever 59 into engagement with the clutchshipper ring 58 to apply the high speed clutch; the link 48, as thelever 59 is swung into thisposition, swinging the lever 4l! away fromthe plunger 31 so that as the cam rotates, the plunger remains idle inits guide bore.

The general mode oi operation of the improved coal cutting machinetransmission mechanism isvas follows: The machine may be moved rapidlyover the `mine oor at a high moving speed under the control of the lever15 of the operating means for the highspeed` clutch I8,

fio

the feed cable being attached to an anchor at the face and the feed drumwinding in the cable to drag the machine over the mine oor. When theVmachine is properly positioned with respect to the coal face, the highspeed clutch is released and the motor 9 is reversed, so that the lowspeed gearing is driven in the proper direction to eiect rotation of thefeed drum in low speed winding direction, and the cutter chain is thenconnected in the usual manner to the motor, thereby to eiect rapidcirculation oi the cuter chain about the margin of the cutter bar. Thefeed cable is then extended from the feed drum to the cutter bar 4, thecutter bar locking means then released, and the lever 15 is thenoperated to move the low speed clutch operating means into a positionwherein the spring effeots loading of the clutch 21; andas a result, the`feed drum is rotated at a low speed to wind in the feed cable,` therebyswinging the cutter bar about its pivot to make a horizontal sumping cutbeneath the coal face. When` the cutter bar is in the righteangleposition shown in Fig. 1, thelever 15 is operated to eiect release ofthe low speed clutch and the cutter bar is locked to the machine bodybythe locking means. The

feed cable is then extended from the feed drum along the coal face to asuitable anchor located at the face in advance of the machine,v and theoperator then operates the lever "J5 to againrnovev the operating meansfor the low speed clutch 21 into the position wherein the coiledclutch-loading spring effects loading of the clutch; and as a result,the feed drum is rotated to wind in the feed cable to feed the machineat a relatively low cutting speed along the coal face to make a`horizontal cut beneath the coal face. During the bar swinging andmachine feeding operations, that is, When the bar is operated'to effectits cutting function, the handle tti may be op of the coiledclutch-loading spring to effect an`v intermittent low speed drive, andby adjusting the handle 46 the time intervals of clutch release may bevaried as desired, it being possible speed clutch clutch 2l Withoutchanging the previous setting to eifect drum lrotation at a low speedbetween zero and a predetermined maximum low speed. During the'cuttingoperation along the coal face, the lever l5 may be operated to effectrelease of the low speed clutch 2l against the pressure of the coiledclutch-loading spring, to apply the `30` high speed clutch it to effectrotation of the feed drum in unwinding direction at a relatively highspeed, thereby to place slack in the feedl cable, it thereafter beingpossible to release the high i3 and re-apply the low speed termined highspeed in'the opposite, unwinding direction. When it is desired tor'otatethe feed drum at a high speed in cablewinding direction, the motor 9 isreversed.

As a result of this invention, it will bev noted that an improvedtransmission mechanism is provided for a coal cutting machine, wherebythe machine may be fed through a wide range of low speeds and'at apredetermined high speed, having improved controlling means whereby thedrive may be shifted from low speed to high speed in an improved manner.It will further be noted that by the provision of the intermittentclutch-loading means for the low speed drive, embodying a coiled springplaced under a predetermined compression, i together with means forintermittently releasing the low speed clutch, it is possible to obtaina low speed drive having a maximum load limit, the coiled springyielding to permit clutch slippage when the low speed vclutch isvoverloaded. It will still further be noted that by the provision of theimproved controlling means for the clutches, and the improved loadingmeans for the low speed clutch, it is possible quickly to shift from lowspeed drive to high speed drive, and thereafter back to low speed drive,without the necessity of resetting the loading means for the low speedclutch, the conntrolling means being operated by but a single manualcontrol element. Other uses and advantages of the improved transmissionmechanism will be -clearly apparent to those skilled in the art. v

While I have in this application specifically described one form whichymy invention may assume in practice, it will be understood `that thisform of the same is shown for purposes of illustration and that theinvention may be modified and embodied in various lother forms withoutdeparting from its spirit or thescope of the appended claims.

What lv claim as new and desire to secure by Letters Patent is: y

1. In a transmission mechanism,fhigh and low Aspeed driving meansembodying a high speed drive clutch and a low speed drive clutch, meansfor automatically intermittently applying and releasing said low speedlclutch at predetermined time intervals including means adjustable forvariably setting said clutch applying and releasing 'meansintermittently to apply and release said clutch at different timeintervals to vary the low speed drive, and manually operable meansoperatively connected to an element o'f said automatic meansandfselectively disposable in positions respectively to relieve said lowspeed clutch from action of said automatic means and apply said highspeedclutch, and to release said high speed clutch and render saidautomatic means effective automatically to apply and releasev said lowspeed clutch, in each such position and during transit between suchpositions maintaining the adjustment of said variable setting meansunchanged whereby, following a period of high speed drive, there may bea direct returntothe same intervals as before of auto-` maticapplication and release of the low speed clutch.,

2. in a transmission mechanism, high and low speed driving meansembodying av high speed drive clutch and a low speed drive clutch, meansfor automatically intermittently applying and releasng said low speedclutch at predetermined time intervals including means for variablysetting clutch applying and releasing means intermittently to apply andrelease said clutch at different time intervals to vary the low speedrive, and manually operable means operatively connected to an element ofsaid automatic means for relieving said low speed clutch from theac tionof said automatic means and for applying said high speed clutch, saidmanually operable means operabie following an application of said highspeed 'clutch to release said high speed clutch and render saidautcinaticineans effective automatically to apply and release said low`speed clutch without changing the setting of said automatic means whichvaries the time intervals: of

automatic application and release of said low speed clutch, Saidmanually operable means including a manual operating member common toboth clutches.

S. In a transmission mechanism, a drive clutch, clutch applyingflever, aspring acting on said lever and set at a predetermined clutch loadingpressure, means including devices for providing timed impulses and fortransmitting the same to said lever for automatically swinging thelatter the pressure exerted by said spring for Y a clutch applyinglever,a` spring acting on said" lever and set at apredetermined clutch loadingpressure, means connectedito said lever for swing- Aing the latteragainst the pressure exerted `by said springfor intermittently`releasing said clutch at timed intervals including a rotatable cam and`a lever actuated by'said cam and connected to said clutch applyinglever, and `means for varying the time intervals oi clutch release`includ-- ing means for adjusting the fulcrumpoint of said secondmentioned lever, said lulcrum point adjusting means including anadjustable lever to which `said second mentioned lever is pivotally las' connected and means for swinging said last mentioned lever about itspivot. i

i 5. In a transmission mechanism, a drive clutch,

a clutch applying member, means for yieldingly urging said clutchapplying member toward 'clutch applying position comprising aspringacting on said clutch applying member and set at a predetermined clutchloading pressure, means connected to said clutch applying member forautomatically actuating `the latter against the pressure exerted by saidspring `to effect `intermit tent release of said clutch at timedintervals, and

o manually operable means for rendering said automatic clutch releasingmeans ineffective and thereafter manually rendering said automatic meanseifective again with the same timed intervals of automatic clutchrelease as before.

6; In a transmission mechanism, a drive clutch,

aclutch applying lever, a spring acting on said lever for yieldinglyurging thelatter into clutch loading position, means acting against thepres,- sure exerted by saidispring for automatically swinging said leverintermittently tolrelieve the load on said clutch at predetermined timedinter- Vals, and manually operable means for rendering said automatic`clutch releasing means ineffective and thereafter manually renderingvsaid automatic means eiective without changing the timed intervals ofautomatic clutchrelease.`

7. In a transmission mechanism, a drive clutch, a clutch applying lever,aspring actingwonv said leverior yieldingly urging the latter intoclutch `loading position, means acting against the pres- `sure exertedby said spring for automatically swinging said lever intermittently torelieve the load on said clutch at predetermined timed intervalsincluding a continuously rotating cam and o connections actuated by saidcani and connected to said lever, and manually operable meansoperatively connected to said lever for rendering `saidautomatic clutchload relieving means inef `fective and thereafter manually renderingsaid automatic means elective Without changing the timed intervals ofclutch load release. a 8. In aitransmission mechanism, a driveclutch,

a `clutch applying lever, a spring acting on said lever for yieldinglyurging the latter into clutch loading position, means acting against thepres- `sure exerted by said-,spring for automatically swinging saidlever intermittently to relievethe load on said clutch at predeterminedtimed intervals including a continuously rotating cam, a lever actuatedby said cam and a link connecting said last mentioned lever` to saidfirst mentioned lever, and means for adjusting the fulcrum point of,`said second mentioned lever to vary the time intervals of clutchrelease.

` f9. In a transmission mechanism, a high speed gear train having a highspeed terminal gear, a low speed gear train having a low speed terminalgear, said terminal gears rotating in rela-` tively oppositedirections', a driven member, a

clutch for connecting said driven member to said high speed terminalvgear for rotating said mem-` ber at a high speed in one direction, aclutch for connecting said, driven member to said low `speed terminalgear for rotating said member at a lo-w speed inthe opposite direction,means for automatically effecting release of said low speed clutch attimed intervals to effect intermittent rotation of said driven memberand embodying means for varying the time intervals of clutch release,and manually operable` means associated with said means for releasingthe W speed clutch applying the high speed clutch, and operative tothereafter effect release of the `high* speed clutch and to reapply saidlow speed clutch without changing the time intervals of automatic lowspeed clutch release. i

1G. In a transmission mechanism, high and 10W speed driving meansembodying a high speed drive clutch anda low speed drive clutch,yieldable means set at a predetermined clutch loading pressure forapplying said low speed clutch and acting constantly to urge said loWspeed clutch toward applied position, means associated With` saidyieldable means for automatically releasing said low speed clutchagainst the action `of said constantly acting yieldable means at`predetermined time intervals, and manually operable means associatedwith said yieldable clutch load- 1 ling means and embodying at least apart of the `latter for relieving said loW speed clutch from the actionof said automatic means and for apdetermined clutch loading pressure,means associated with said automatic applying andreleasing means fordetermining the time intervals of clutch application and release, andmanually operable means associated with said automatic means opera-bleto release said clutch from the action of said automatic a, means torelease said clutch, said manually operable means thereafter operable torender said automatic means active automatically to apply and releasesaid clutch Withoutr varying the setting of said associated means whichdetermines the time intervals of clutch` application and release.

l2.`In a transmission mechanism, a drive` clutch', means forautomatically applying and releasing said clutch at predetermined a timeintervals, said clutch applying means set at a p-redetermined clutchloading pressure, means associated with said automatic applying `andreleasing means for varying the time intervals of clutch application andrelease, and manually operable means associated with said automaticmeans operable to relieve said clutch from the action of said automaticmeans to release said clutch, said manually operable means thereafteroperable` to render said automatic means active automatically to` applyand release saidclutch without varying the setting of said associatedmeans which varies the time intervals of clutch application` andrelease.

l means to release said low speed clutch and to apply said high speedclutch, said manually operablemeans operable following an application oflsaid vspeed clutch to release said high speed. clutch and render saidautomatic means effective automatically to apply said low speed clutchWithout varying the setting of said associated means which determinesthe time intervals of apn plication and release of said lovv speedclutch.

14. In a transmission mechanism, high and low speed drivingmeanslincludinga low speed drive clutch and a high speed drive clutch,automatic 3 applying and releasing means including means set at a`predetermined clutch loading pressure for l automatically applying saidlow speed clutch at predetermined time intervals and embodying means"associated with said automatic applying means for varying lthe timeintervals of clutch applications, and manually operable means associatedwith said automatic means operable to relieve said low speed clutch fromthe action of said automatic means to release lsaid low speed clutch andto apply said high speed clutch, said manually operable means operablefollowing an application of said high speed clutch to release said highspeed clutch and'render said automatic means effective automaticallytoapply andrelease said low speed clutch Without varyingthe setting ofsaid associated means Which Varies the time intervals of application andrelease lof 1 said low speed clutch.

15.*In a transmission mechanism, a drive clutch, aclutch applying lever,a spring acting on saidl lever for yieldingly urging the latter intoclutch loading position, means acting against the A`l0 pressure exertedby said spring for automatically swinging said lever intermittently torelieve the load on said clutch at predetermined time intervalsincluding a continuously rotating cam, connections actuated by said camand connected to said lever, and means for adjusting the action of saidcam actuated means to alter said predetermined time intervals, andmanually operable means operatively connected to said lever for movingthe latter to render said automatic clutchloading-relieving meansineiective and for thereafter rendering said automatic means effectiveagain with' the same timedv intervals of clutch load release aspreviously.

16. in atransmission mechanism, a drive clutch, a clutch applying lever,means for automatically swinging said lever intermittently to relievethe load on the clutch at predetermined time intervals including meansadjustable While said lever swinging means is in operationfor'alteringvsaid time intervals, and distinct means, also controllable While saidlever swinging means is inmotion, for swinging said lever to disconnectsaidv nrst mentioned means and to move said lever completely to unloadsaid clutch.

' JOSEPH F. Jove.

CERTIFICATE OF CORRECTION.

Patent No., 2,190,926. February 2o, 19m.

JOSEPH F., JOY.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows Page 2, ondcolumn, line Y, for "rotatble" read -rotriteible;` page 5, umn, line 62,for "cuter" seosecond colread cutter; page 6, first column, line 16,

olaim l5, after the word "said" first occurrence, insert high; and

that 'the said lLetters Patent should be read with this .correctiontherein that the same may conform to the record of' the Case in theVPatent Office,

signed and sealed this 27th day of August, A. Do 19m.

Henry Van Arsdale,

(Seal) Acting Commissioner of Patents.

